diff --git a/src/email.ts b/src/email.ts
index 0e4bd88..cf588f4 100644
--- a/src/email.ts
+++ b/src/email.ts
@@ -159,10 +159,10 @@ const fetchMessages = (
  */
 type EmailMatcher = (email: Email) => (message: FetchMessageObject) => boolean;
 const matchesEmail: EmailMatcher = (email) => (message) => {
-  const subjectMatches = email.subject === message.envelope.subject;
+  const subjectMatches = email.subject === message.envelope?.subject;
   const bodyMatches =
-    message.bodyParts.get("text")?.toString().trim() === email.text.trim();
-  const headers = message.headers.toLocaleString();
+    message.bodyParts?.get("text")?.toString().trim() === email.text.trim();
+  const headers = message.headers?.toLocaleString();
   const fromMatches = headers.includes(`Return-Path: <${email.from}>`);
   const toMatches = headers.includes(`Delivered-To: ${email.to}`);
   return subjectMatches && bodyMatches && fromMatches && toMatches;